Electrical control of hybrid exciton transport in a van der Waals heterostructure
Artikel i vetenskaplig tidskrift, 2023
Interactions between out-of-plane dipoles in bosonic gases enable the long-range propagation of excitons. The lack of direct control over collective dipolar properties has so far limited the degrees of tunability and the microscopic understanding of exciton transport. In this work we modulate the layer hybridization and interplay between many-body interactions of excitons in a van der Waals heterostructure with an applied vertical electric field. By performing spatiotemporally resolved measurements supported by microscopic theory, we uncover the dipole-dependent properties and transport of excitons with different degrees of hybridization. Moreover, we find constant emission quantum yields of the transporting species as a function of excitation power with radiative decay mechanisms dominating over nonradiative ones, a fundamental requirement for efficient excitonic devices. Our findings provide a complete picture of the many-body effects in the transport of dilute exciton gases, and have crucial implications for studying emerging states of matter such as Bose–Einstein condensation and optoelectronic applications based on exciton propagation.
Författare
Fedele Tagarelli
Ecole Polytechnique Federale de Lausanne (EPFL)
Edoardo Lopriore
Ecole Polytechnique Federale de Lausanne (EPFL)
Daniel Erkensten
Chalmers, Fysik, Kondenserad materie- och materialteori
Raul Perea Causin
Chalmers, Fysik, Kondenserad materie- och materialteori
Samuel Brem
Philipps-Universität Marburg
Chalmers, Fysik, Kondenserad materie- och materialteori
Joakim Hagel
Chalmers, Fysik, Kondenserad materie- och materialteori
Zhe Sun
Ecole Polytechnique Federale de Lausanne (EPFL)
Gabriele Pasquale
Ecole Polytechnique Federale de Lausanne (EPFL)
Kenji Watanabe
National Institute for Materials Science (NIMS)
Takashi Taniguchi
National Institute for Materials Science (NIMS)
Ermin Malic
Philipps-Universität Marburg
Chalmers, Fysik, Kondenserad materie- och materialteori
A. Kis
Ecole Polytechnique Federale de Lausanne (EPFL)
Nature Photonics
1749-4885 (ISSN) 17494893 (eISSN)
Vol. 17 7 615-621Graphene Core Project 3 (Graphene Flagship)
Europeiska kommissionen (EU) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.
Ämneskategorier
Atom- och molekylfysik och optik
Annan fysik
Den kondenserade materiens fysik
DOI
10.1038/s41566-023-01198-w